javascript 讓window.open的彈出視窗置中

from http://www.pt.ntu.edu.tw/hmchai/PTcomputer/hJavaScript/JSwindow.htm
http://boray06.blogspot.tw/2011/04/windowopen.html
http://www.study-area.org/coobila/tutorial_275.html


讓window.open的彈出視窗置中
function openwindow(url,name,iWidth,iHeight)
{
  var url;     //網頁位置;
  var name;    //網頁名稱;
  var iWidth;  //視窗的寬度;
  var iHeight; //視窗的高度;
  var iTop = (window.screen.availHeight-30-iHeight)/2;  //視窗的垂直位置;
  var iLeft = (window.screen.availWidth-10-iWidth)/2;   //視窗的水平位置;
  window.open(url,name,'height='+iHeight+',,innerHeight='+iHeight+',width='+iWidth+',innerWidth='+iWidth+',top='+iTop+',left='+iLeft+',status=no,location=no,status=no,menubar=no,toolbar=no,resizable=no,scrollbars=no');
}